Counterbalancing mechanism for embroidering-machines.



M. SGHOENFELD. GOUNTERBALANGING MECHANISM FOR EMBROIDERING MACHINES. APPLICATION FILED NOV. 1, 1912.

1,086,471 Patented Feb. 10, 1914.

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UNITED STATES PATENT OFFICE.

MORRIS SCHOENFELD, O1? RORSCHACH, SWITZERLAND.

COUNTERBALANCING MECHANISM FOR EMBROIDERING-MACHINES.

To all whom it may concern:

Be it known that I, Mounts SorIonNrELD, a citizen of the United States, and a resident of Rorschach, in the Canton of St. Gall, Switzerland, have invented certain new and useful Improvements in Counter-balancing Mechanism for Embroidering-Machines, of which the following is a specification.

My invention relates to a mechanism for counterbalancing the movable tambour frames in large embroidering machines.

More particularly my invention relates to that class of counterbalancing device wherein a movable weight is arranged to counterbalance the tambour frame through suitable levers and wherein a spring, or springs, is interposed between the tambour frame and counter weight to cushion the movements thereof and relieve the machine of pounding.

The object of my invention is to provide an e'fiicient means for periodically holding the weight and periodically releasing the same to assume a new position according to the repositioning of the tambour frame as the latter is moved from one stitch position to another. The purpose thereof is to effectively hold the weight stationary during a definite period, and to release it at a definite period in order that the weight will not move at the exact moment that the tambour frame moves, but at a subsequent moment, and when the sewing needles are in the fabric, which is at the time that the tambour frame is stationary.

Another object thereof is to hold the weight stationary during a longer period than a single stitch period of the machine, in order that the counterweight will not move as often as the tambour frame. This is to reduce the shocks and vibration incident to a rapid operation of the machine. The springs interposed between the tambour frame and weight permit the former to move at one time and the weight to move subsequently thereto. In the present case I have provided a very efficient device for positively holding the weight for definite periods.

Another object of my invention is to operate the device for releasing the weight from the acquard or automat.

Specification of Letters Patent.

Application filed November 1, 1912.

Patented Feb. 10, 1914-.

Serial No. 729,015.

In the drawings forming part of this application, Figure l is an elevation of an embroidering machine, and a jacquard or automat, showing my invention applied thereto, Fig. 2 is a sectional view thereof, taken on the line 2-2 of Fig. 1, Fig. 3 is a detail view, illustrating approximately the position of the needle and fabric at the moment the weight is allowed to move.

I have shown a stationary frame 1 of an ordinary embroidering machine, and a movable tambour frame 2 which is adapted to be moved in a vertical plane, in the usual manner. There is a bracket 3 on one end of the machine frame, which supports a lever 4, one arm 5 of which lever has a roller 6 engaging the roller guide 7 on one end of the tambour frame. Another bracket 8, on the opposite end of the stationary frame, supports a lever 9, one arm 10 of which has a roller 11 engaging the roller guide 12 of the tambour frame. The tambour frame is supported through the levers A and 9 which move with the former. Upwardly extending arms 13, 1 1, on the levers A, 9, are connected by a rod or strap 15, whereby both levers are caused to move in unison and the tambour frame is caused to move in parallelism throughout.

An arm 16 of the lever 1 supports a rod 17 which is fulcrumed thereto at 18; and the lower end of the rod is fulcrumed to an arm 19 which is fulcrumed at 20 to a stationary part of the machine. A yoke 21 is secured to the rod 17 and springs 22 secured to the yoke, are also secured to a weight 9.3 which is movable along the rod 17. From the above connections it will be observed that the weight opposes the tambour frame and therefore counterbalances the same.

The weight 28 has a sleeve 2 1 which is provided on its faces with ratchet teeth 25, 26. Upon a suitable bracket 27 is fulcrumed an angle lever 28, to one arm 29 of which is fulcrumed a shoe 30 having teeth or serrations like the teeth 26 on the sleeve 24-, and with which they are adapted to cooperate. Upon another bracket 31 is fol crumed angle lever 32; and on the same shaft as this lever there is an arm 33 on which a shoe s4 is fulcrumed. The shoe also has teeth or serrations which corre spend and cooperate with the ratchet teeth 25 on the sleeve 24:. The lever arms 36, are drawn by a spring 37 for the purpose of causing the shoes 30, 34ito clamp the sleeve 24L. Arms 38, 39, extending respectively, from the levers 28, 32 are connected by a link 4:0, thereby forming a toggle joint between the levers. The lever 28 has an arm l1 extending therefrom, to which is fulcrumed an operating rod jacquard or autoinat for operating the embroidering machine is represented at 43, its shaft at having thereon a gear A shaft 4-6 arranged near the shaft lat is provided with a gear e7 which meshes with the gear so, so that shaft t6 will be operated from the jacquard shaft. In the fullest embodiment of my invention the gear 45 is made smaller than the gear l7, say, for instance, one half th size thereof, so that the shaft t6 will be operated at a slower speed than shaft at. The rod 42 which operates the arm all is guided by the shaft 46 which passes through a slot 48 therein, the rod being thereby adapted to reciprocate up and down. A roller 49 on the lower end of the rod $2 engages with a cam 50 on the shaft 46, so that at each revolution of the latter the rod 42 will be drawn downwardly sufliciently to rock the lever 28 and cause its shoe 30 to disengage from the ratchet teeth 26. hen.- ever this takes place the lever 32 will also be rocked, by reason of the arms 38, 39 and link lO, so that the shoe 3% will be moved away from the teeth at the same time that the shoe 30 moves away from the teeth 25. A shaft 51, suitably supported, carries a cam 52 which contacts with an arm 53 forming part of the lever 32. The shaft 51 is turned by a handle 54; and that operates the arm 53 and therefore the levers 28, 32, whenever it is desired to release the weight by hand. As the jacquard shaft revolves, the movement is transmitted through gears 45, 47 to shaft 46 on which the cam 50 is mounted. The latter is so positioned that it will draw down the rod 42 at a time when the needles are in the fabric, as is graphically illustrated in Fig. 3, and therefore at a time when the tambour frame of the machine is at rest. When the rod 42 moves downwardly the shoes 30, 3t, will-both be positively disengaged from the ratchet teeth and conse quently the weight will be free to move to a higher or lower position, according to the movement or movements of the tambour frame which tool: place while the weightwas held. Thus the movement of the eight follows after the movement of the tambour frame and at a time when the latter has come to rest. When the high portion of the cam disengages from the roller so the spring 3? will draw the levers 28, 32, so that their shoes 30, 34, will clamp upon the ratchet teeth of the sleeve 2% and hold the weight stationary. Owing to the ratchet and toothed shoes the weight will be firmly held by the action of spring 37 There will be no lateral mov ment of the weight caused by the clamping members.

Having described my invention, what I claim is 1. An embroidering machine comprising a stationary frame, a movable tambour frame, means connected with the stationary frame for supporting the tambour frame, a counterbalanoing weight connterbalancing the tambour frame, yielding means interposed between the tambour frame and weight whereby the movement of the tambour frame may precede the movement ,of the weight, a serrated or ratchet member associated with the weight, a clamping jaw having a serrated or ratchet portion cooperating with the serrated member associated with the weight, yielding means for causing said jaw to clamp said serrated member and means operated with the embroidering machine and adapted to periodically release said jaw.

2. An embroidering machine comprising a stationary frame, a movable tambour frame, means connected with the stationary frame for supporting the tambour frame, a counterbalancing weight counterbalancing the tambour frame, yielding means interposed between the tambour frame and weight whereby the movement of the tambour frame may precede the movement of the weight, a serrated or ratchet member associated with the weight, a clamping jaw having a serrated or ratchet portion cooperating with the serrated member associated with the weight, yielding means for causing said jaw to clamp said serrated member and means operated with the embroidering machine and arranged to periodically release the said jaw while the tambour frame is stationary.

An embroidering machine comprising a stationary frame, a movable tambour frame, means connected with the stationary frame for supporting the tambour frame, a counterbalancing weight for counterbalancing the tambour frame, yielding means in terposed between the tambour frame and weight whereby the movement of the tambour frame may precede the movement of the weight, a ratchet device for holding the weight and means periodically operating the ratchet device to delay the movements of the weight and manual means for releas ing said ratchet device independently of said periodically operating means.

at. An embroidering machine comprising a stationary frame, a movable tambour frame, a weight counterbalancing the tambour frame, yielding means interposed between the weight and tambour frame whereby the movement of the tambour frame may Signed at St. Gall in the Canton of St. Gall, Switzerland, this 15th day of October 1 1912.

precede the movement of the Weight, a serrated or ratchet member associated with the Weight, serrated or ratchet shoes coiiperating with said serrated or ratchet member to hold the Weight, a toggle lever for operating said shoes, and means operated with the embroidering machine and periodically operating said toggle lever.

MORRIS SCHOENFELD.

Witnesses CAESAR Lone, FRIEDRICH STEINER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

